Cathodic protection


Metals are in constant change when they are in contact with air or water in any situations that they are. Cathodic protection comes reliable when such circumstances arise. It is defined as the process through which the surface of a given metal is protected against corrosion. Corrosion affects most metal surfaces when they react with other circumstances. The method was first introduced and developed by Sir Humphrey Davy in the year 1824. He improvised it to be used as a way of reducing and controlling corrosion on the British naval ships. The process is used to protect the metal surface by making it the cathode of the source of power. The cathode is the negative part of a cell while the anode is the active role of an energy producing element.


It is clear that the method of protection connects the element or metal to be protected to an exposed metal that is easily corroded. The exposed metal that is applied as a sacrifice corrodes instead of the protected metal. Two main types of cathode protection are commonly used. They are the galvanic and the impressed current systems. They are both utilized in the prevention of corrosion on metal surfaces of most equipment and surfaces. Modern technology allows all modern pipelines to be coated with an organic protective coating to prevent them from corrosion. The method is applied to various products: pipes are mostly used to transport liquid substances thus they should be protected from any corrosion that they face. Pipes that carry hazardous products in them are always shielded by a system that consists of a DC (Direct Current) power source, an anode and, a powered transformer rectifier.


Protection is also applied on ships. Ships are always in constant motion and in contact with water and other liquids that may affect their functioning. It is achieved and implemented by attaching galvanic anodes to the hull of the ships and boats and Impressed Current Cathode Protection (ICCP) for larger vessels. The galvanic anodes are always replaced when the ships are taken out of the water to be inspected and maintained. Companies using steel in concrete that are used in tall buildings are also advised to use the method when erecting their buildings. The method is somehow different since it involves inserting of the anodes and the relevant reference electrodes into the concrete when it is being poured during construction. It can also be applied in the construction of bridges. A bridge being more exposed is allowed to use more anodes distributed throughout the bridge due to the atmospheric exposure.


In conclusion, the method is the best way of protecting exposed metal surfaces to reduce corrosion. Corrosion is an enormous loss that can happen to most people that are involved in conducting their businesses beneath or in the water. Pipes are commonly used to transport liquids are in more threat to corrosion, but this can be controlled using the method. Individuals and companies can reduce accidents that lead to spending enormous amounts in compensation.


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